Mathematics · Geometry
Trapezoid Area Calculator
Find trapezoid area from the two parallel base lengths and perpendicular height.
Inputs and results stay in this browser. Change one value at a time to explore the relationship.
Calculation steps
- Add bases: 6 + 10 = 16.
- Average base = 16 ÷ 2 = 8.
- Area = 8 × 4 = 32.
Definition and formula
The area equals the average length of the parallel sides multiplied by their perpendicular separation.
A = (a + b)h ÷ 2
Worked example
Bases 6 and 10 with height 4 give (6 + 10) × 4 ÷ 2 = 32 square units.
Common mistake
Use the perpendicular height, not the length of a slanted side.
How to learn with this calculator
Begin with the worked example, then change one value while keeping the others fixed. Compare the new result and calculation steps to identify which part of the formula changed.
Clear answers
Frequently asked questions
What does the Trapezoid area do?
Find trapezoid area from the two parallel base lengths and perpendicular height.
How does the Trapezoid area work?
The calculator applies A = (a + b)h ÷ 2. The area equals the average length of the parallel sides multiplied by their perpendicular separation.
What can I learn from the Trapezoid area?
It connects the mathematical rule to your chosen numbers and shows each calculation step. Change one input at a time to see how the result responds.
Does MW SysArc receive or store what I enter?
No. The calculation runs locally in your browser. MW SysArc does not receive or store your calculation inputs.
How should I use the result?
Use the steps to understand the method, then verify important school or professional work using the notation and rounding rules required in your setting.
Last reviewed 2026-07-14. Calculations tested 2026-07-14.